Seaming is believing

TODD J. MARTINEZ

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Seaming is believing

机译：接缝相信

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Most of the modern understanding of chemistry, including the very notion of a well-defined molecular structure, rests on the concept of a potential energy surface (PES) - a 3N-dimensional 'landscape' that plots the total energy of a collection of N atoms as a function of the atomic positions. The PES can be used to determine several useful features, such as the most stable configuration of atoms, or the pathway along which atoms 'travel' during a reaction. Intersections of these surfaces (known as conical intersections) are thought to have an important role in transitions from excited states to ground states of molecules, but direct evidence of this has been hard to find. Reporting on page 440 of this issue, Polli et al. use ultrafast optical spec-troscopy to follow the motion of the molecule retinal - whose light-induced isomerization forms the basis of vision - through a conical intersection.

机译：现代化学的大多数理解，包括定义明确的分子结构的概念，都基于势能表面（PES）的概念-3N维“景观”，绘制了N集合的总能量原子作为原子位置的函数。 PES可用于确定几个有用的功能，例如最稳定的原子构型，或原子在反应过程中沿着其行进的路径。这些表面的交点（称为圆锥形交点）被认为在分子从激发态到基态的跃迁中起着重要作用，但是很难找到直接的证据。 Polli等人在此问题的第440页上进行了报道。使用超快速光谱仪通过圆锥形相交点追踪视网膜分子的运动-视网膜分子的光诱导异构化形成视觉的基础。

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来源
《Nature》 |2010年第7314期|P.412-413|共2页
作者
TODD J. MARTINEZ;
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作者单位

Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA SLAC National Accelerator Laboratory, Menlo Park, California;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种 eng
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Seaming is believing

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